Blasting cartridge



G. WEBER Jan. 12, 1932.

BLASTING CARTRIDGE Original Filed March 20, 1929 Patented Jan. 12, 1932GUILLAUME WEBER, F HAYANGR, FRANGE, AssIeNoR 'ro Las Fisterra-Final DEFRANCOIS DE WRNDEL a om, or PARIS, FRANCE BLASTING CARTRIDGE Originalapplication Ailed March 20, 1929, Serial No. 348,870, and in FranceDecember. 26, 1928. Divided and this application med June 7, 1930.serial No; 459,686.

The invention relates to blasting cartridges which contain cellulosicmaterials, adapted to absorb liquid oxygen, li uid air or the'lke,metallic powders, hydrocar ons and inert ma.-

5, terials, and it has for its object to dispose the various substanceswithin the cartridge in such manner as to reduce the sensitiveness ofthelatter to shock. y

Certain metallic powders, such'as very fine o aluminium powder, somecombustible organic materials, such vas cork liour and soot are verysensitive to shock. On the contrary, sawdust, peat, inert materials (forexample dust from high furnace gases), certain metallic powders in -astate of coarser division, such as ferro-silicium powder have acomparatively vlittle sensitiveness to shock.

In order to reduce the sensitiveness'of the cartridge to shock andaccording to theinvention, it is suiicient, in certain cases, to mix, insuitable proportion, the material having a small sensitiveness to shock(such as cellulosic materials, which are thoroughly dried at a hightemperaturebelow the carbonizing point) with the materials which arevery sensitive to shock, such as fine metal powders in order to increasethe safety with which the cartridges may be handled.

However, a greater safety will be obtained by enclosing the materialswhich are sensitive to shock within small bags or cases, similar tosmall cartridges, preferably with rigid walls, or by concentrating suchmaterials, without any enclosure, at the middle of the cartridge so asto protect them against shocks, dueto the surrounding mass of materialsof small sensitiveness to shock.A

In the case where use is made of a hydrocarbon, such as naphthalene,lthe metallic powder which is sensitive to shock is previously mixed withsaid hydrocarbon.

The cellulosic materials, such as sawdust and peat are thoroughly driedin order to impart thereto a great absorbing power for liq- 45 uidoxygen, as 'described in my co-pending patent application No. 348,670.When the cartridges are used in coal mlnes and when it is desired togive them the maxlmum degree of safety, said cartridges areA 5opreferably provided with a tube or duct through which water or a spongymaterial saturated with water is introduced into the mass, said waterfreezing during the immersion of the cartridge into liquid oxygen, thuslowering the temperature of explosion due to 5 the meltingandvaporization of this water. at the instant of the explosion.

The water should be separated from the cellulosic materials in order toprevent any reduction of the absorbing power of the cartridge and of itseffective life, and to prevent the explosive from hanging fire, whichmay be very dangerous in coal mines.

l he appended drawing shows by way of example a cartridge according toone embodiment of the invention.

.Referring tothe drawing, 1 denotes the cartrid e casing, consisting forexample of a yiel ing tube formed by superposed envelopes (usually from3 to 5) of combustible or inert material. This casing is sealed at oneend by a bottom part 2, and at the other end by a top member 3, havingan axial bore through which extends a tube 4 provided with a plug 5.Within casing 1 is enclosed the mass of. 5 thoroughly dried cellulosicmaterial 6, adapted to absorb liquid oxygen. At the middle of the massof cellulosic material is arranged a small casing 7 with rigid walls,containing the materials which are very sensitive to shock, for examplea mixture of finely divided metallic powders with naphthalene.

When it is desired to lower the'temperature of the explosion, water or aspongy material 9, saturated with water, is introduced through tube 4. v

The cartridge is ired in any suitable manner.

In the appended claims, when'I use the term oxydizing liquefied gas, Imean any v liquid containing liquid oxygen, either pure or mixed with avariable amount .of liquid nitrogen.

Having now described my invention what I claim as new and desire tosecure by Letters Patent is:

l. A blastin cartridge adapted to be impregnated wit an oxydizingliqueed gas comprising a casing, anl absorbing material filling saidcartridge and a tube extending 100 into said cartridge and eontaining aspon material adapte to be impregnated wi of the explosi n.

' 2. A eartrid ehqontainin a cellulosie material previously dried'at a ih'temperature so as to remove all moisture an having a, hi h absorbingcapacity for liquid oxygen a tu extending to the middle ofthe cartridge,liquid oxygen impregnating said material and spongy materials saturatedwith water adapted to be introduced in to the middle of the cartridgethrough said tube. l V

In testimony whereof I have signed my name to this specification.

GUILLAUME WEBER.

water and to lereby reduce the temperaturev i

